My son has been Batman Villains for the past 2 years, so this year he was Riddler. I purchased the suit at 2 different resale shops. Jacket was sprayed with fabric glue and covered with green glitter. I used silver glitter glue to draw in the ?(front and back).
For the pants I simply created 3 different lines with gold, green and silver glitter on each side of the pants. The bowler hat was purchased 2 years ago for $1 at target or St. Patricks day. Added purple ribbon to the brim, and created the symbol with crafty fuzzy wire. The cane was bought at party city, and I used a cereal box to cut out 2 ?s and added glue and green glitter. I attached them with a clear rubberband then stapled the tops together. I gathered some old purple fabric, cut a piece and gathered and safety pinned it to the shirt.
Makeup was done to create a half mask, half ? symbol, with glitter added. Sprayed hair red.
I got many compliments for this Riddler DIY Child Halloween Costume Idea.
Related costumes:
Best Homemade Riddler and Two Face Couples Costume! 
Coolest Riddler Costume 
Batman Villain Costumes: Penguin and The Riddler 
Great Group Costume: Poison Ivy, The Riddler, Harley Quinn Vs. Batman 
Gothams Coolest Villains: Poison Ivy and The Riddler 
Coolest Homemade Riddler Costume Ideas 
DIY Riddler Costume for 3-Year Old Boy Obsessed With All Things Batman 
Authentic Frozen Family Costume – Elsa, Olaf, and Kristoff
that is the coolest costume ever made. not going to find that at wamart
Did you use a black suit jacket? And, where did you get enough glitter to cover the jacket? Also, how did you make the question marks? Did you cover the jacket each time you put one on? I’m going to try this, but I’m a little inexperienced.